hi death,

originally, about 10 years ago, the idea was to use a 2 rail sweep. several years later, the developer of mecway discovered that rhino was tilting the airfoils. i did some testing and confirmed this. i also found it had a huge impact on the natural frequencies. the mass distribution was way off throughout the model. basically, rhino can't be trusted to do anything right. over time i found just a normal loft worked best. but what you are finding is part of the problem. rhino screws up various things along the way. one of them is the quality of the airfoils. in the model i attached, when you go from cartesian to cylindrical it messes up the curves. this ends up messing up the fillet operation. but one thing you show, seems to be what michael has shown too. that being, moi seems to do a much better job at filleting than rhino. so that's great news. i look forward even more to switching. thanks for your efforts wrt topic. it's helpful